Quasar X-ray and UV flux data are weak but consistent with BAO and H(z) data, and the joint data mildly favor closed spatial geometry and dynamical dark energy over flat LambdaCDM.
A Hubble diagram for quasars
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abstract
The cosmological model is at present not tested between the redshift of the farthest observed supernovae (z ~ 1.4) and that of the Cosmic Microwave Background (z ~ 1,100). Here we introduce a new method to measure the cosmological parameters: we show that quasars can be used as "standard candles" by employing the non-linear relation between their intrinsic UV and X-ray emission as an absolute distance indicator. We built a sample of ~ 1,900 quasars with available UV and X-ray observations, and produced a Hubble Diagram up to z ~ 5. The analysis of the quasar Hubble Diagram, when used in combination with supernovae, provides robust constraints on the matter and energy content in the cosmos. The application of this method to forthcoming, larger quasar samples, will also provide tight constraints on the dark energy equation of state and its possible evolution with time.
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astro-ph.CO 1years
2019 1verdicts
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Quasar X-ray and UV flux, baryon acoustic oscillation, and Hubble parameter measurement constraints on cosmological model parameters
Quasar X-ray and UV flux data are weak but consistent with BAO and H(z) data, and the joint data mildly favor closed spatial geometry and dynamical dark energy over flat LambdaCDM.